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Failure Cases Of Super Duplex Stainless Steel Pump Components

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The application of corrosion resistance alloys such as 25% Cr super duplex stainless steel (25Cr SDSS) has expanded in the oil & gas industry recently as new technologies made it feasible for Oil and Gas operators to invest in high sour and corrosive fields. 25Cr SDSS material is often used in critical applications such as piping, rotating equipment, coolers, and instrument components etc. SDSS materials are well known for the 50/50 austenite (γ) and ferrite (α) microstructure which provides the combination of corrosion resistance and high-performance mechanical properties. 

Product Number: 51322-17689-SG
Author: Janardhan Rao Saithala, Amjad Kharusi, Mohammed Ghafri, Ossama Mohammed, Abdul Majeed, Manish Kulkarni, Talal Nabhani
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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$20.00
$20.00

25 Cr super duplex stainless steel (SDSS) centrifugal pumps have found vast applications in the Oil & Gas industry for produced water injection systems. An important factor in water injection pump material selection is the need to provide adequate corrosion resistance throughout the operating life cycle. Presence of solids and/or other contaminants in the pumped fluid (e.g. traces of solids, water cut percentage, hydrogen sulphide, chlorides, oxygen, and carbon dioxide content) can impact the corrosion resistance of water injection pumps. SDSS material is used in critical pump components such as casing body, impellers, shafts, balancing lines etc. The main focus of this paper is to present two cases of SDSS centrifugal pump component failures associated with a casing body and balancing line. Pitting corrosion mechanism was found to be the root cause of the both pump component failures. The factors contributed to these two failures will be discussed, in addition lessons learned & mitigation measures will be proposed.

25 Cr super duplex stainless steel (SDSS) centrifugal pumps have found vast applications in the Oil & Gas industry for produced water injection systems. An important factor in water injection pump material selection is the need to provide adequate corrosion resistance throughout the operating life cycle. Presence of solids and/or other contaminants in the pumped fluid (e.g. traces of solids, water cut percentage, hydrogen sulphide, chlorides, oxygen, and carbon dioxide content) can impact the corrosion resistance of water injection pumps. SDSS material is used in critical pump components such as casing body, impellers, shafts, balancing lines etc. The main focus of this paper is to present two cases of SDSS centrifugal pump component failures associated with a casing body and balancing line. Pitting corrosion mechanism was found to be the root cause of the both pump component failures. The factors contributed to these two failures will be discussed, in addition lessons learned & mitigation measures will be proposed.

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In recent decade, the applications of DSS have significantly increased in oil & gas industry, due to their attractive properties compared to austenitic grades with similar corrosion resistance. The DSS products exhibit a better resistance to pitting, stress corrosion cracking and higher mechanical properties compared to other austenitic stainless steel grades. The microstructure of these materials consists of approximately 50% austenite (γ) and 50% ferrite (α) phases, obtained by means of a solution heat treatment.
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09194 Evaluation of Crevice Corrosion Resistance of Duplex and Super Duplex Stainless Steels for Seawater Pumps

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The crevice corrosion resistance of duplex and super duplex stainless steels used for seawater pumps was evaluated by comparing the to results tests conducted using actual seawater  with the behavior of the stainless steels in artificial seawater
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